Hello Paola,
thank you for the information.
The original browser is quite alright. But if you type in that link:www.rohde-schwarz.com
no characters are shown anymore and even the app is affected.
If I type in:www.conrad.de
the browser would close.
I wonder if the programmers of the app are aware of this.

By the way, I have written a (Windows-)tool for converting Firefox/Opera Bookmarks to the PB format. If you are interested, you will find the file "PocketbookBM.zip" here:http://home.arcor.de/guentermeinel/download.html
Unfortunately, it is written in German. But it's easy: load the html-file(exported from the PC browser) and (perhaps after editing) save the xbel file.